Further to the previous answer to Question 181534 which was as follows; CID was delivered through a phased rollout that was initiated with Asylum cases and was then subsequently rolled out to cater for settlement, enforcement and nationality case working processes as well as assisting Borders. CID has been the source immigration case working system for UKVI since 1998, over this time however the department has digitised application routes through a web-based service called Access UK and are in the process of replacing CID functionality with a new product named ATLAS. Please note that paper files are used alongside these systems to aid case working processes.
The Home Office treats information management and data security with upmost sensitivity. Whilst there have been no systematic loss of immigration status records in the roll-outs of the aforementioned systems, as with the migration of any large data mass, occasional discrepancies may occur. Where any cases are identified or raised as having incorrect or incomplete records, these are treated as an absolute priority.